Response Surface Method based Investigation of a Premixed Charge Compression Ignition Engine: Blending Lemon Seed Oil with Hydrogen
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Abstract
This study investigates the impact of hydrogen variations on the emission, combustion and performance characteristics in a Premixed Charge Compression Ignition (PCCI) engine using a dual-fuel mode. Lemon seed oil (LSO), which was extracted through solvent extraction, served as the primary fuel. First 5ppm SiO nanoparticles was used across all blends due to their higher oxygen content. The LSO used was mixed with diesel in different proportions (B10, B20, B30 and B40) using mechanical stirring. The secondary fuel used had the constant hydrogen flow rate at 6 lpm, which was directly fed through the inlet manifold. The B20 blend has decreased the brake thermal efficiency (BTE) by 0.3% compared with base fuel due to improper combustion taking places. The highest BTE was achieved with diesel when compared with other fuel blends. At 80% load condition, the CO emission with fuel blend B20 was reduced by 22.22% when compared with diesel due to the addition of nanoparticles. When compared to the base fuel, the NOX emission with fuel blend B20 was reduced by 10.6% due to proper mixing of air and fuel. The unburnt hydrocarbon (HC) emission with fuel blend B20 was decreased by 13.75% when compared with diesel due to addition of nano-additives. The presence of oxygen in the biodiesel increases with the percentage of additives, which can decrease the emission of HC. Lowest smoke emission was observed with the fuel blend B20 when compared with diesel, due to improvement in the air-fuel mixture.
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